MDC motion products are vacuum compatible precision instruments ideal for
demanding in-vacuum sample handling applications. The motion feedthrough product
line presented in this section is divided into three basic categories including
rotary, linear and multi-motion instruments. Each product category is comprised of one or more of the
following drive configurations: standard, high temperature, pneumatic, miniature, precision,
magnetic and direct drive.
Motorization is available for most motion instruments featured throughout this
catalog. High, medium and low torque, DC stepper motors as well as conventional AC motor
options are available. Please note that motor controls are not included with motorization
options and must be purchased separately. Detailed motor specifications as well as
control electronics are offered in the motorization section.
Precision motion instruments detailed herein are available for either high or
ultrahigh vacuum service. High vacuum products are mounted on ISO standard KF flanges. Better
known in the industry as the MDC Kwik-Flange™, these versatile flanges provide
quick-make and quick-break installation, making them ideal for vacuum systems
requiring frequent assembly and disassembly. Sealing is achieved by compressing a Viton® elastomer
between two mating flanges fastened with a single, hinged aluminum clamp.
Ultrahigh vacuum devices are fitted with industry standard, Conflat® compatible, Del-Seal™ CF metal seal flanges. MDC Del-Seal™
CF flanges are designed with a standard knife-edge sealing geometry which produces
a seal through cold-flow deformation of a copper gasket. Del-Seal™ CF
flanges are typically used in UHV environments where high temperature bakeouts are a must.
Bakeout temperatures greater than those specified may be achieved by disassembling
and removing temperature sensitive components. Please reference feedthrough
instruction manuals or contact MDC’s technical staff for higher temperature ratings
and detailed instructions on instrument disassembly and low temperature
component removal. For maximum vacuum integrity, reliability and extended service life all motion
device actuator seals incorporate edge welded stainless steel bellows
Standard rotary motion feedthroughs are a practical and economical solution for rotary
motion in most vacuum applications. Rotary motion position is measured along a 360°
laser etched scale graduated in 5° increments. Welded stainless steel bellows
with a unique off-axis wobble design, combined with rotary shaft bearing supports,
provide rotary motion of unsurpassed reliability and performance. In contrast to
standard rotary motion products, the high temperature standard rotary motion devices
are constructed entirely of 304 stainless steel to endure the rigors of high temperature
Pneumatic drive rotary products are designed for in-vacuum shutters and other light-duty
two-position motion applications. Pneumatic drive rotation is adjustable from 30° to 90°.
Miniature rotary motion feedthroughs are specifically designed for in-vacuum light-duty
service where torques will not exceed 20 ozin. Their small footprint makes them ideal for
applications with severe space limitations.
Precision rotary motion instruments are a step higher than standard rotary motion
products. They offer greater precision with very low backlash and a display resolution of
Magnetically coupled rotary motion feedthroughs provide basic rotation and UHV
compatibility without the use of bellows . This product is intended for light-duty service not
exceeding 20 oz-in of torque. Direct drive rotary motion products provide
basic rotation with HV compatibility. Vacuum integrity is maintained by a single preloaded Viton®
elastomer shaft seal. Fitted with dual rotary bearing shaft supports, this device can
be manually or mechanically operated at intermittent speeds of up to 300 rpm. They
are mounted on MDC Del-Base™ 1" baseplate mounts.
Differentially pumped direct drive rotary motion feedthroughs provide 100 lb-in
maximum rotational torque and 500 rpm maximum rotation. The rotary shaft is
supported by two radial bearings located inboard of dual Viton® elastomer shaft seals.
The region between the seals can be differentially pumped through a 1/8" female
pipe thread port provided to attain UHV compatibility to 10-9 Torr.
MDC’s ferromagnetic fluid rotary motion feedthroughs were developed to offer a high quality solution for a variety of demanding rotary motion applications at low cost of ownership.
Ferromagnetic fluid is a low vapor pressure fluid in which extremely small magnetic particles are suspended.
Simply stated a ferromagnetic feedthrough is a flanged cylinder with a pair of roller bearings supporting a central rotating shaft. The shaft is a high magnetic material that is precision machined. A series of grooves are machined in either the shaft or pole pieces that sandwich a permanent magnetic. A liquid O-ring seal is formed by suspending the ferromagnetic fluid in front of the poles creating a magnetic circuit. The feedthrough is hermetically sealed against gas, vapor and other contaminants under both static and dynamic conditions while providing virtually no friction between the rotating and stationary components.
- 1:1 compliance of the shaft provides zero backlash
- Frictionless rotation with low drag torque
- Smooth translation with no particle generation.
- High Torque Transmission
- Capable of continuous high speed rotation
- Multiple mounting options available
- Solid and hollow shaft configurations
- Non-cooled and water-cooling configurations
- The standard fluid is hydrocarbon based and suitable for most applications. Optional fluorocarbon based fluid is available for reactive gas environments
- Customized solutions available on request
- Competitive pricing
- Del-Seal™ Flange (CFF); Baseplate Mount; Threaded Mount
- O-ring Sealed Flange; Cartridge Mount
- Leak rate: 5 x 10-9 std. cc/sec, He
- Temperature Range: -6° to 80°C (non-cooled)
- Temperature Range: 150°C (water-cooled)
- Vacuum range: 10-9 Torr
- Max. operation pressure: 28 PSIG
- Bearing lubrication: Krytox (H) / Fomblin (F)
Standard linear motion feedthroughs are the perfect solution for most linear displacement
vacuum applications. Linear position is measured along both radial and linear scales
laser etched on actuator barrel and housing. Radial and linear scales are
graduated in 0.001" and 0.025" increments respectively. One revolution of the barrel translates into
0.025" of linear travel. The housing’s linear scale also includes graduation in 1mm
increments for added convenience. Edge welded stainless steel bellows, a 40 pitch
lead screw design and the use of linear bearing shaft support provide devices with
excellent durability and performance. Unlike the standard motion products the high
temperature linear motion feedthroughs are constructed entirely of 304 stainless steel to
endure the rigors of high temperature vacuum service.
Compact high temperature linear motion feedthroughs have a small footprint and are
constructed with high temperature vacuum grade materials. Linear position is measured
along a laser etched stainless steel barrel graduated in 20 equally spaced increments.
A full revolution of the barrel translates into 1.25mm of linear travel. Formed stainless
steel bellows, a 1.25mm fine pitch lead screw design and the use of radial
bearings provide this product with excellent durability and performance. All drive mechanism
components are located on the atmosphere side of the reentrant formed bellows.
Miniature linear motion feedthroughs are specifically designed for light-duty service.
Full revolution of the barrel translates into 0.025" of linear travel.
Push-pull linear motion feedthroughs are the most basic of the manual motion devices
offered in this catalog. They provide quick action linear motion via a stainless steel
hand-held actuator shaft. They are typically operated by observing instrument motion
through a vacuum viewport. For quick and easy positioning the feedthrough body has
been laser etched with linear travel graduation marks in increments of 0.025".
The actuator can be locked in position by tightening an integral lock
knob located on the actuator housing.
Rack and pinion linear motion feedthroughs are very similar to push-pull devices, but
provide finer control of linear motion. The 90° rack and pinion drive mechanism provides a
quick-action drive with greater control than push-pull devices. For quick and easy
positioning the feedthrough body has been laser etched with linear travel graduation
marks in increments of 0.025". A 1-1/4 turn on the handle generates 1 inch of linear
travel. The actuator can be locked in position by tightening an integral lock knob located on
the actuator housing.
Pneumatic linear motion feedthroughs provide two-position fast action linear
motion. Typical motion applications would include on-off, open-close and in-out motions
similar to those of in-vacuum shutters. Linear travel can be shortened or
lengthened via an integral stroke adjustment knob. For quick and easy positioning the feedthrough body
has been laser etched with linear travel graduation marks in increments of
0.025" Heavy duty manual, pneumatic and push pull linear motion feedthroughs allow linear
displacement of heavier samples and components. With the exception of the
precision micrometer fitted unit, these devices do not provide position
indication. Position of samples or components being moved must be verified visually. Unlike
conventional motion feedthroughs, heavy duty models employ reentrant welded
Multi-motion feedthroughs are instruments with more than one degree of freedom. This
product category includes combinations of linear, rotary and wobble motion.
Rotary-linear standard devices offer 360° of rotation and one inch of linear travel via two
separate drive knob actuators. Both rotary and linear positions are measured along a
laser etched actuator barrel and housing. The 360° rotary scale is graduated in 5°
increments. The linear scale has both a linear and rotary scale component, the linear
portion is graduated in 0.050" increments while the rotary portion is graduated in
0.001" increments. Full revolution of the linear scale produces 0.025" of travel.
Precision rotary-linear motion instruments are a step higher than the standard rotarylinear
products. They offer greater precision with very low backlash, a rotary display
resolution of 0.1°, and 0.500" of micrometer precision linear travel with 0.001" resolution.
Wobble stick multi-motion devices with linear, angular wobble, rotary and articulated
pincer configurations are available in this product category. The most elaborate device
provides 360° sample rotation, 4.50" of push-pull linear travel, 22° of angular
tilt or wobble and a mechanical pincer jaw with 0.880" diameter sample capacity.